Did you change your settings to limit the emails you would get?
If you're clicking on something when you are on the hub, you are probably turning off the follow button. Usually, when you comment on a hub, you're automatically following it unless you opt out by pressing that button. If the button says 'unfollow,' then you are already following it by default.
Since you can reduce emails in your account settings & turn off email notices, you might want to check there to see if that might be the problem?
When you say 'following,' do you mean the hubs or the Hubbers? Those are two different things, and your question refers to people but the dialogue under it talks about following hubs.